Posts tagged with "Thornton Tomasetti":
“The safety of everyone who visits the Salesforce Transit Center is our obligation and highest priority. While this appears to be a localized issue and we have no information that suggests it is widespread, it is our duty to confirm this before we allow public access to the facility."Thornton Tomasetti, the engineer-of-record for the project, did not immediately respond to requests for comments for this story. PWP Landscape Architecture was the landscape architect for the project. It is unclear if the issue at hand is in any way related to recent reports of the pothole-like depressions that have been spotted along the walkway of the rooftop garden in recent days. The nearby Millennium Tower designed by Handel Architects has also suffered mysterious structural anomalies since it opened in 2016. A recent report indicates that the structure was leaning as much as 18 inches to the west. AN will continue to monitor the situation and report updates as news on the transit center takes shape. Update 10:30am PST: The streets around the transit center remain closed this morning as crews work to inspect the structure for further anomalies. Reports indicate that the cracked support member was last inspected a year ago and that it is made from American-produced steel. Salesforce Transit Center officials have planned a news conference for noon Pacific time to provide an update on the investigation.
"When we designed Eden over twenty years ago, this was the largest installation of ETFE, which had principally been used for small sports buildings," said Andrew Whalley, Partner & Deputy Chairman at Grimshaw Architects. Whalley was, of course, referring to the Eden Project in the U.K.'s southwest, the project that put ETFE and its use for buildings on the map. Previously, the material had been used mostly in the aerospace industry, with the odd agricultural project thrown in. Now it was being used for huge, bulbous "biomes" that drew inspiration from Buckminster Fuller.
"I think the Eden project certainly gave it a much higher profile, which led quickly to its use on several high-profile buildings. This rise in popularity has lead to a continual refinement in the product, and with secondary applications," added Whalley.Grimshaw has since gone on to be a pioneer of the polymer in architecture. Their U.K. National Space Center in Leicester was another landmark project, and, more recently, the firm has stepped it up a level, with the dazzling Disney resort, "Tomorrowland," in Shanghai. Whalley continued, "Current ETFE is much more transparent than its earlier version, is available in a range of color tints. It can be fritted, and combining this with variable air pressures can change the amount of light passing through the envelope." Light and colour certainly abound at Tomorrowland. David Dennis, Associate Principal at Grimshaw explained how this was achieved through a double-layered ETFE cushion that spans 164 feet across a complicated twin-gridshell canopy. This is then held in place by custom-formed aluminum clamps that respond to the tight bending and twisting of the structure. "ETFE’s inherent flexibility permitted spanning these complex forms. Meanwhile, advancements in imbedded color and custom-applied ‘frit’ patterns enabled a backdrop suitable for both daytime and nighttime light shows," elaborated Dennis. "The canopy structure required a lightweight cladding that could keep guests dry and comfortable in Shanghai’s wet summers. At the same time, it also needed to be an expressive and iconic canvas for lighting effects and projections that celebrate Disney’s stories and capture the Tomorrowland theme of an optimistic future," he added. "ETFE met these needs, providing flexibility of form and advanced capacity for showcase." But how is ETFE being used on U.S. shores? Alloy Kemp, a Senior Project Engineer at Thornton Tomasetti's New York office, was on hand. The engineering firm has already worked on numerous ETFE facades, including Banc of California Stadium (for the Los Angeles Football Club, MLS), the U.S. Bank Stadium (for the Minnesota Vikings) and the Hard Rock Stadium (for the Miami Dolphins) in Florida. Right now, Thornton Tomasetti is working with Diller Scofidio + Renfro (DS+R) and the Rockwell Group on The Shed at Hudson Yards which, yes, you guessed it, has an ETFE facade. According to Kemp, The Shed uses a pneumatic system, whereby three foils made into a panel are inflated with air. "The air is not structural; it serves to stabilize the foils," said Kemp. "The outer foil is fritted (printed with silver ink in a dot pattern) to reduce the light transmission of the panel into the space." The middle foil, meanwhile, is clear, and the inner foil is white, with 20 percent opacity. Kemp remarked that the "overall effect is to diffuse and scatter the direct sunlight into the space." ETFE is also representing the U.S. on foreign soil, too. Back in the U.K., Philly-based studio KieranTimberlake Architects recently used the material to clad the U.S. Embassy in London. Partner at studio Matthew Krissell told AN how the "single layer tensioned membrane," arranged in an array of sails on three sides of the building, optimized natural daylighting with a high level of transparency. Meanwhile, the scrim also provided a second air gap to give further resistance to thermal transfer.
"Ethylene tetrafluoroethylene" doesn't exactly roll off the tongue. Thankfully "E-T-F-E" does. The material—commonly referred to by its acronym—is all the rave within the architecture world right now, mostly notably seen in contemporary stadia design.
A Project Engineer at New York firm, Thornton Tomasetti, Alloy Kemp spoke to The Architect's Newspaper about the material's key role in stadia projects such across the U.S. These included: the Banc of California Stadium (for the Los Angeles Football Club, MLS) and the U.S. Bank Stadium (for the Minnesota Vikings).
With regard to the latter example, the stadium makes use of a 240,000-square-foot transparent ETFE roof—the largest of its kind in the country. Here, transparency facilitates clear views outside and bathes the playing field in natural light. This also aids climate control within the space, a key factor when growing pitch-perfect grass. While the ETFE system facilitates solar gains, excess heat vents at the stadium's peak supplement ventilation requirements.
The latter meanwhile uses the material expose the structure as a roof clad with 190,000 square feet of ETFE film reveal long-span cantilevers. Kemp pointed out that the material lets a full spectrum of UV light through, something "which aids in plant growth." She also cited the material's "high span to weight ratio" and "its ability to warp" that allow "lighter and sparser structure," as a main reason for its selection. Additionally, kemp added that a low friction coefficient means with regular rainfall, it is capable of cleaning itself with little maintenance necessary.
Another stadium, this time for the LA Rams team, also makes use of ETFE. The stadium, designed by New York–based HKS, features a giant triangular roof supported by thick columns and made of the material. This super-roof also spans across an adjacent outdoor lobby called “champions plaza” to be used as a communal gathering spot for game day spectators. For year-round events, the stadium features a transparent ETFE canopy covering nearly 19 acres. The canopy allows all sides of the building to remain open to the air, allowing natural breezes to pass through while protecting the up to 80,000 patrons from inclement weather.
Alloy Kemp will be speaking at the next Facades+ conference in New York on April 6 There she and Edward Peck of Forum Studio will discuss ETFE's use in the LA Football Club and Minnesota Vikings stadiums as well as in the DS+R's Hudson Yards Culture Shed. Seating is limited. To register, go to facadesplus.com.